When Exxon’s Torrance refinery exploded last February, it injured four workers and took down an air pollution filtration system twelve stories high. That hobbled a refinery feeding Southern California 20 percent of its gasoline, and exacerbated a gasoline price spike. Californians wound up paying $10 billion more for their gasoline than elsewhere in 2015 as refineries gouged and gorged on swollen refining profits.